Dynatrace automatically discovers all your individual disks and detects anomalies such as low available disk size or slow disks. There are different kind of disks on a host such as a boot disk, a disk holding all the logs or a disk for storing business data. While alerting on low disk space would not make any sense for a fixed sized boot disk image, it makes perfectly sense for a disk containing critical business data. Within the anomaly detection settings you can define rules to fine tune the disk alerting thresholds on an enterprise scale. Global disk alerting rules are based on disk name patterns and groups of tagged hosts. To define a new disk alerting rule, navigate to Settings > Anomaly detection > Infrastructure, as shown within the screenshot below:
Running in automatic mode Dynatrace detects low disk space for all monitored disks if the amount of free space is less than 3% of
the overall disk capacity. Custom disk anomaly detection rules can be used to distinguish between different kind of disks within
A disk anomaly detection rule always contains a filter for disk names. Additionally, all your hosts can be grouped and filtered by
tags. While you can easily select relevant disks by defining a disk name pattern, you can also define different thresholds for
tagged groups of hosts.
A typical use-case here is to define strict thresholds for production machines, while you accept lower ones for development hosts.
A specific rule on a group of disks automatically overrides the global threshold that is used for all other disks within your system. Below you find a screenshot that shows how to define your own anomaly detection rule for specific disks:
Host level disk alerting settings can be used to override the global settings for a selected single disk on a specific host, as it is shown within the screenshot below: